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// SPDX-License-Identifier: GPL-2.0-only
/*
* ChaCha stream cipher (RISC-V optimized)
*
* Copyright (C) 2023 SiFive, Inc.
* Author: Jerry Shih <jerry.shih@sifive.com>
*/
#include <asm/simd.h>
#include <asm/vector.h>
#include <crypto/chacha.h>
#include <crypto/internal/simd.h>
#include <linux/linkage.h>
#include <linux/module.h>
static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_zvkb);
asmlinkage void chacha_zvkb(struct chacha_state *state, const u8 *in, u8 *out,
size_t nblocks, int nrounds);
void hchacha_block_arch(const struct chacha_state *state,
u32 out[HCHACHA_OUT_WORDS], int nrounds)
{
hchacha_block_generic(state, out, nrounds);
}
EXPORT_SYMBOL(hchacha_block_arch);
void chacha_crypt_arch(struct chacha_state *state, u8 *dst, const u8 *src,
unsigned int bytes, int nrounds)
{
u8 block_buffer[CHACHA_BLOCK_SIZE];
unsigned int full_blocks = bytes / CHACHA_BLOCK_SIZE;
unsigned int tail_bytes = bytes % CHACHA_BLOCK_SIZE;
if (!static_branch_likely(&use_zvkb) || !crypto_simd_usable())
return chacha_crypt_generic(state, dst, src, bytes, nrounds);
kernel_vector_begin();
if (full_blocks) {
chacha_zvkb(state, src, dst, full_blocks, nrounds);
src += full_blocks * CHACHA_BLOCK_SIZE;
dst += full_blocks * CHACHA_BLOCK_SIZE;
}
if (tail_bytes) {
memcpy(block_buffer, src, tail_bytes);
chacha_zvkb(state, block_buffer, block_buffer, 1, nrounds);
memcpy(dst, block_buffer, tail_bytes);
}
kernel_vector_end();
}
EXPORT_SYMBOL(chacha_crypt_arch);
bool chacha_is_arch_optimized(void)
{
return static_key_enabled(&use_zvkb);
}
EXPORT_SYMBOL(chacha_is_arch_optimized);
static int __init riscv64_chacha_mod_init(void)
{
if (riscv_isa_extension_available(NULL, ZVKB) &&
riscv_vector_vlen() >= 128)
static_branch_enable(&use_zvkb);
return 0;
}
subsys_initcall(riscv64_chacha_mod_init);
static void __exit riscv64_chacha_mod_exit(void)
{
}
module_exit(riscv64_chacha_mod_exit);
MODULE_DESCRIPTION("ChaCha stream cipher (RISC-V optimized)");
MODULE_AUTHOR("Jerry Shih <jerry.shih@sifive.com>");
MODULE_LICENSE("GPL");
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